For such a large place with home theater use I'd expect a the FV12 to be a better choice than either. That port will give you that extra performance at 20-30hz where it counts in a movie. Of course if you really must have sealed I would lean toward the Rythmik, but for HT I personally prefer ported subs. For Music I prefer sealed because the 20-30hz is rarely needed.Just wondering what would be overall more satisfiying for: HT 70% , Music 30%.
Room is in basement :4000cf with opening for staircase only ??